Earrings by Josef Koppmann These 18ct white gold earrings with black spinel are designed and handmade by Josef Koppmann. Features Primary Material : 18ct white gold Length (mm) : 38 Fitting Type : Hook Dimensions (mm) : 38x8x18 One of a Kind : Yes Metal : 18ct white gold Gems : black spinel Hallmarked : No Wire Material : 18ct white gold Cleaning InstructionsThe earrings are best kept clean by rubbing and brushing gently under running water with bicarbonate of soda. Do not submerge in water for long periods.